Austin Wintory

Well other than the initial first generation of consoles (NES: Mario, Zelda, et al), my first really powerful gaming experiences came with the LucasArts adventure games (Monkey Island, Day of the Tentacle, and later games like Full Throttle, The Dig and possibly to this day my all-time favorite game: Grim Fandango).

I loooooved the music in those games as well, though the first time I remember being especially professionally impressed with a game score was, I think, Jeremy Soule's Total Annihilation.